High-frequency discharge apparatus.



PATENTED FEB. 25, 1908.

J. E. SEBLEY.

HIGH FREQUENCY DISCHARGE APPARATUS.

APPLICATION FILED NOV.26, 1906.

Z SHBETSSHEET 1.

mi y J W M No. 880,046. PATENTED FEB. 25, 1908. J. E. SEELEY.

HIGH FREQUENCY DISCHARGE APPARATUS.

APPLICATION FILED NOV.26, 1906.

2 SHEETS-SHEET 2.

1- 5 7% M, a hwwlvfw UNITED STTES ATEN i@E.

JAMES E. SEELEY, OF LOS ANGELES, CALIFORNIA, ASSIGNOR-TO SYNOHRONOUSSTATIC COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.

MGHFREQUENCY DISCRGE APPARATUS.

Specification of Letters Patent.,'

Patented Feb. 25, 1908.

Application filed November 26. 1906. Serial No. 345.2%-

One object of the invention is to provide,

in such an apparatus, induction means for producing the dischar e whichwill also operate as a transformer when on alternating cur rent, tosupply energy by induction from the supply line to the charging circuit.

Another objectof the invention is to provide for energizing theinterrupter of the discharge apparatus without direct connection of saidapparatus to the line.

Another object of the invention is to provide inductive means which willoperate efficiently both on alternating and direct circuit connections.p I

Another object is to provide sufficient induction in the chargingcircuit to give the requisite charge to the condenser, without at thesame time producing such impedance as to prevent flow of sufficientcurrent from the line to give the full output of the apparatus.

The accompanying drawings illustrate the invention:

Figure 1 is a diagram of an electric discharge apparatus embodying theinvention. Fig. 2 is a perspective of the polarizing means for theinterrupter. Fig. 3 is a diagram of another form of the invention. Fig.4 is a perspective of a part of the combined inductance and transformermeans in Fig. 3. Fig. 5 is a diagram of another form of the invention.

Referring to Fig. 1, the apparatus comprises discharge terminals 1connected to the secondar 2 of an induction coil whose primary 3 isconnected to one side of a condenser t, the other side of which isconnected through the interrupter 5 to the other side of the primary 3of the induction coil. The in terrupter 5 ma be of any usual or suitableconstruction, ut is shown as a ribbon stretched b an adjusting screw 6to vary its tension an rate of vibratiombaclr and front contacts 7, 8between said ribbon vibrates,

.itsei and an armature 9 carried by said ribbon and acted uponby anelectromagnetic device 10 consisting of a coil on core 12. Saidelectro-. magnetic device is energized to produce periodic operation ofthe interrupter, the periodicitfy being determined by the interrupter ondirect current and being determined by the frequency-of the alternatingcurrent when the latter is used. Such operation of the electro-magneticdevice is efiected by an energizing connection, which with directcurrent, is supplied with energy from the line and with alternatingcurrent, is supplie with energy b induction from the line. To enablethis e ectro-inagnetic device to respond quickly to the energizinimpulses, its core .12 is preferably laminate soft iron and in order togive a quick action to the interrupter the said core is preferablypolarized, as by means of a ermanent steel magnet contacting therewit atone end. Said steel magnet is shown as consisting of two members 13placed end to end and inter-locking with the soft iron core 12, see Fig.2.

14 represents an electro-ma netic device which serves as atransformerorproducing by induction from the line current for energizing theinterru ter and for charging the condenser, and a so serves as a meansfor rovidin the pro er amount of inductance in the c arging circuit.Said electro-magnetic induction device, M is provided with twowindings'15, 16 wound on a core 17, the winding 15 comprising a pair ofcoils wound on two legs or sides of saidcore, and the winding 16comprisin a pair of coils Wound respectively over or a ongside of thecoils 15. Core 17 is preferably a closed iron circuit core, the windingsand switching connections of the coils being such that on alternatingcurrent both pairs of coils act conjointly to produce magnetic flux inthe same direction in the core m a closed magnetic circuit, and ondirect current the coils act oppositely on the core so as to producepolarization or an open magnetic circuit, the coils 15, 16 on the upperleg, for example, acting to produce polarit in one direction and thecoils i5 and 16 on the lower leg acting to produce polarity in the oposite direction, sothat the poles are deve oped on the line zc-'a:.Such change in the connections of the coil for alternating and directcurrent is edected by means of a switch comprising blades 19, 20, 21,22, 23, preferably operated in unison, and terminals 39 designates asisting'for example of a coil wound on a core 40 and connected atdifferent points alon its.length to contacts 41 controlled by an 18,wire 47 also bein connected to one side or wire 49 of the primary of thedischarge circuit. The other side 50 of the discharge circuit isconnected to one side ofthe condenser 4 from the other side of which aconnection 51 is made to the interrupter and another connection 52 ismade to the energizing winding 10 for the interrupter. Fromtheinterrupter a wire 53leads to contact 30 of switch 18. The contacts26, 27, 28, 29, and 31 are connected to coils 16 of the induction devicein such manner as to connect the same in series in either directionbetween the Wire 53 and a wire 55, connected to one end of the variableim edance. The contacts 32, 33, 34, 35, 37 o the switch 18 serve asimilar purpose for the coils 15.

The operation is as follows :Assumin that alternating current is beingsupplie b the line Wires 44, 45, the switch 18 is piitced in positionshown in the drawings, and .current entering from wire 44 passes throughswitch 46, wire 48, switch terminal 36', switch blade 23,-terminals 35,34, upper coil 15, terminals 37, 32, switch blade 22, terminal 33, lowercoil 15, wire 59, switch terminal 25, switch blade 19, terminal 24 andwire 47 to the other side of switch 46 and of the line. There is anothercircuit from the wire 59 through the variable impedance and thesecondary coil 16, etc., but as far as the current from the line isconcerned this connection is shortrircuited b switch blade 19 and neednot be considere There is thus impressed upon the induction device thefull alternating electro-motive force ofthe line and the alternatingmagnetic flux thereby developed in said induction device generates inthe seconda coils 16, an induced current passin upper coil 16'to terminas 28, 29, switch blade 21, terminal 30, wire 53,'interrupteroperating)winding 10, connection 52, interrupter 5, ack contact 7 orfront contact 8, primary dischar e circuit 49, wire 47, terminal 24,switch lade 19, terminal 25, wire 59, contact arm 42, variable im edance39, lower coil 16, contact 27, switch la de 20 terminals 26, 31 to theother side of the coil 16. The windings of the coil 15, 16 are such thatthis discharge impulse is of considerably higher potential than thealternating supply. t is variable impedance con-v as fo lows :-From 'ofthe core of the induction device or transformer and at the same time theself induction of the device which is used to charge the condenser isrendered sufiiciently high for that purpose. A further object of thisconstruction is that it enables the proper intensit of chargingelectro-motive force to be 0 tained, both with alternating current andwith direct current. 'At each chargingimpulse coming from the coils 16and the variable impedance there is an electro-motive force applied tothe opposite sides of the condenser, this, however, being insufficientto produce a high frequency discharge. A further effect of this chargingimpulse is to operate the interrupter by energizing, such operationbeing in synchronism with the current in the supply circuit? At themoment of the break, for example,- at the back contact, the kick fromthe coil 16 and the impedance and also from the coil 10 charges thecondenser, and the condenser then discharges in a high frequencyoscillatory discharge, in the circuit 4, 51, 5, 7, 49, 3,

50, thereby generatin in the secondary 2 of breaks at the front contact8, the polarized core 12 serving to cause positive operation of theinterrupter in both directions. The number of impulses for the givennumber of operations of the interrupter is thereby doubled. It will benoted that in case of alternating current, by suitably proportioning thewinding 10 and the condenser 4 thereof, to secure quick action, theinterrupter ma be 0 erated by the current pass- 15 ing from t e 001 s 16into the condenser even when contacts 7 and 8 are open, the capacity ofthe condenser allowing suflicient current flow to start the vibratorinto operation.

For operation on direct current, the front 20 contact 8 should be movedout of operating position, leaving the interrupter in contact with theback contact. The switch 18 is turned down to close contact withterminals 28, 31, 34, 37, and switch 46 is placed in one or the otherposition, accordin to the direction of the sup ly current. T e currentwill then ass as foilows:From wire 44 through switc 46 to wire 47,primary discharge c rcuit wire 49, interrupter contacts 7, interrupter5, wire 52, coil 10, wire 53, terminal 30, switch blade 21, terminal 31,upper coil 16, terminal 28, switchblade 20, terminal 27, lower coil 16,wire 55, impedance 39, switch 42, wire 59, lower coil 15, terminal33,switch blade 22, terminal 34, upper coil 15, terminal 37, switch blade23, Wire 48 and the other side of the switch 46 of the line. The twopairs of coils 16, 15 are thus placed in series, the current passingtherethrough in a direction to produce polarization or open circuitmagnetization of the core on the llne a:w in two oppositely directedmagnetic circuits; upper coils 15, 16 polarize the upper half 'of thecore in one direction and lower coils 15, 16 polarize the lower half inthe opposite direction. The core thus acts as an open magnetic circuitgiving a sharp, quick discharge on breaking the energizing circuit. Thehigher reluctance due to this open magnetic circuit is compensated forby the fact that the energizing coils15, 16 are connected in series oneach side, the action of coil 15 being supplemented by coil 16, whichhas a greater number of turns. This placing the two coils in series isalso of advantage in that the mean effective electro-motive force in adirect current circuit of given nominal potential is higher than that ofan alternating current circuitof the same nominal potential andtherefore requires a greater number of, turns. At each operation of theinterrupter by the direct current flow as above, the condenser ischarged and dischar es in a high frequency oscillatory currentsubstantially as above described.

The form of the invention shown in Fig. 3 is similar to that in Fig. 1except that the electromagnetic induction device 60 is Wound so that thecoils 67, 68 thereof act in similar directions both on alternating anddirect current, and the open magnetic circuit which is desirable forobtaining the proper discharge on direct current, is obtained by formingthe core 61 of said device with a bridge 62 which may be moved to makean open magnetic circuit or-to make a closed magnetic circuit. A switch.63 is operated by the movement of this bridge to close connection withcontacts 64 in the circuit 65 from the supply line 47 to the variableimpedance. This circuit may continue through wire 66 to the coils 68 ofthe electromagnetic induction device and by a connection 69 to coil 1-()and thence to the condenser and interru ter and'back to wire 47, asabove describe The coils 67 of the electromagnetic device are connectedby wires 70, 48 to the variable impedance and to the main switch 46. Theconnections are otherwise as above described. The bridge 62 of theelectro-magnetic induction device and the core of said device arelaminated and are preferably interlocked by grooves 72 and pro ections73 as shown in Fig. 4 to decrease the reluctance of the closed magneticcircuit.

When alternatingeurrent is used to supply the apparatus the combinedswitch and ridge device 62 is lowered, closing the magnetic circuit ofthe induction device and also closing the circuit at 63 so that anenergizing circuit for thesaid induction device is established from line44, 45 through wire 47, the impedance. means 39,'coil 67 of theinduction device and return wire 48 to the other side of the line.

For operation with direct current the combined magnetic bridge andswitch 62 is raised, 0 ening the connection at 63 and opening t emagnetic circuit of the induction means 60, so as to enable the latterto discharge rapidly. Current will flow from the line 44 through wire47, to the back contact of the interrupter, through the interrupter tothe other side of the primary discharge circuit, through connection 53,windings 10, 68 and impedance means 39 to contact means 24, and by wire72, and winding 67 to the other side of the line at 45. The current sopassing will energize the interrupter operating magnet, and theinduction device 13 and will change the condenser substantially as abovedescribed In the form of the invention shown in Fig. 5, a switch 73 isprovided for connecting line wire 44 and variable impedance 39, eitherto. the interrupter 75 or to the energizing coil 74 of the inductiondevice 79. The secondary coil 76 of the induction device is connected bywires 77, 78 with the interrupter operating magnet 10 and the condenser.The operation will beunderstood. from the above. Core 80 of theinduction device has a keeper 81. On direct circuit this keeper may bere moved to give the quick discharge.

What I claim is 1. A high frequency discharge ap aratus comprising adischarge circuit, a c arging circuit, a supply circuit, an inductionapparatus having a plurality of windings, means for connecting one ofsaid windings in the supply circuit and the other of said windings inthe charging circuit, and means for connecting both ot said windingsin'the charging circuit.

2. A high frequency discharge ap aratus comprising a discharge circuit,a c arging circuit, a supply circuit, an induction apparatus having aplurality of windings, means for connecting one of said windings in thesupply circuit and the other of said windings in the charging circuit,and means for closing or opening the magnetic circuit of the inductiondevice to adapt it for operation with either alternating or directcurrent.

3. A high frequency discharge ap aratus comprising a discharge circuit,a c arging circuit, a supply circuit, an induction apparatus having aplurality of windings, means for connecting one of said windin s in the.su ply circuit and the other of said windings in the charging circuitsaid induction device my hand at Los Angeles, California, this 16thhavingfa closed circuit: core, and awitch day of November 1906. means orconnecting t e coi s on sai core to energize the core on closed magneticcir- JAMES SEELEY' 5 cuit 0r 1n open magnetic circuits in opposite Inpresence ofdirections. ARTHUR P. KNIGHT,

In testimony whereof, I have hereunto set FRANK L. A. GRAHAM.

